Error Loading OS

[kmenchaca78]

Was playing a game when my pc froze. I restarted then it stated " Error Loading OS "
Not sure whats wrong but scan disk said something about an unrecoverable problem. I am able to use my pc if i put in the windows disk, what must i do to fix the problem?

Thanks for any help.

 

[kimsland]

Either CheckDisk
Vista: http://www.maximumpcguides.com/how-to-use-check-disk-in-windows-vista/
Xp: http://support.microsoft.com/kb/315265

And/Or a HardDrive Diagnostics